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ICS85357AG-11T Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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ICS85357AG-11T Datasheet(HTML) 7 Page - Integrated Circuit Systems |
7 / 12 page 85357AG-11 www.icst.com/products/hiperclocks.html REV. A JULY 25, 2001 7 Integrated Circuit Systems, Inc. ICS85357-11 4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V LVPECL / ECL MULTIPLEXER APPLICATION INFORMATION CRYSTAL INPUT INTERFACE A crystal can be characterized for either series or parallel mode operation. The ICS85357-11 has a built-in crystal oscillator circuit. This interface can accept either a series or parallel crystal without additional components and generate frequencies with accuracy suitable for most applications. Additional accuracy can be achieved by adding two small capacitors C1 and C2 as shown in Figure 6. Typical results using parallel 18pF crystals are shown in Table 7. Figure 6. Crystal Input Interface XTAL_IN XTAL_OUT X1 18pF Parallel Crystal C1 22p C2 27p Table 7. Typical Results of Crystal Input Interface Frequency Fine Tuning Crystal Frequency C1 C2 Measured Output Frequency Accuracy Duty Cycle (MHz) (pF) (pF) (MHz) (PPM) (%) 14.31818 22 27 14.318011 -12 47.46 15.00 22 27 14.999862 -9 47.70 16.66 22 27 16.660162 10 47.70 19.44 22 27 19.440081 4 46.85 24.00 22 27 24.000183 8 46.00 |
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